F4
Rangemaster
Secondary Oven Temperature Sensor Fault
Top oven or secondary cavity fails to heat, display shows F4 when that oven is selected.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Open or shorted top oven sensor, loose sensor connector on PCB, damaged harness to top oven, failed secondary oven control PCB
How to Fix / Troubleshooting
Safety first: Disconnect mains power before working on the cooker.
Steps to check:
- Identify which cavity: Note whether the error appears when using the top oven, grill, or a specific function.
- Locate the second sensor: In dual-cavity Rangemaster models, the top oven has its own sensor probe. Access it from inside the cavity (usually rear wall) and from the rear panel.
- Check connections: Follow the sensor wires to the control PCB. Reseat the connector firmly. Look for corrosion or heat damage.
- Test sensor: Measure resistance at room temperature. Replace the sensor if it is open, shorted, or significantly out of specification.
- Harness inspection: Ensure the harness is not trapped under side panels or by the oven frame. Replace if insulation is damaged.
- If all checks pass: The secondary oven control PCB or the main display PCB may be faulty. Due to live mains and multi-board wiring, this work should be done by a qualified technician.
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Repair Difficulty
Hard
4/5
Required Part
Top Oven Temperature Sensor Probe
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